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Close ratios in transmission.
The gears in your transmission may be sticking or worn out. This would cause your transmission to not be able to shift.
A plugged transmission filter can cause your transmission to hesitate when you shift into drive. A collapsed vacuum hose can also cause the problem.
Allison transmission not shifting
transmission codes
Leaky transmission lines would cause the fluid level to drop and eventually cause the transmission not to shift and go.
what would transmission not to shift in to overdrive
First step try changing the fluid and filter First step try changing the fluid and filter Check
A bad transmission gear can cause your 1999 Nissan frontier to shift hard. Low transmission fluid can also cause the transmission to shift hard.
The only governor I can think of is part of the automatic transmission the helps to control the shift points at which the transmission changes gear ratios.
The transmission may need a flush and filter, or in my 92 accord I solved the problem merely by changing the transmissions computer.
I'm assuming your in an automatic transmission. The only thing that i can think of is your in the rough range where you transmission thinks it needs to shift then doesn't or vise versa. Check gear ratios and timing.